No; Dix, Mr. Tulliver considered, had been as good as nowhere in point of law; and in the intensity of his indignation against Pivart, his contempt for a baffled adversary like Dix began to wear the air of a friendly attachment.
Now, Tom was not fond of quarrelling, unless it could soon be put an end to by a fair stand-up fight with an adversary whom he had every chance of thrashing; and his father’s irritable talk made him uncomfortable, though he never accounted to himself for the feeling, or conceived the notion that his father was faulty in this respect.
There are no more uses of "adversary" in the book.
Show samples from other sources
Then, again, our military training is in many respects superior to that of our adversaries.
Thucydides -- Pericles’s Funeral Oration
Finally, it was rumored, there would be complete information-sharing among all of these previously disconnected and even adversarial entities, and when they were coordinated, and once all the health data they’d collected was shared, most of this made possible through the Circle and more important, TruYou, viruses could be stopped at their sources, diseases would be tracked to their roots.